The HGLN-CAT6AJ lightning and surge protector provides superior lightning and surge protection with improved frequency response for 10/100/1000/10000 (10G) Base-T Ethernet networks. It is designed for use with CAT6a Ethernet cabling, but can also be used with CAT5, CAT5e and CAT6 cabling. The use of ultra-low capacitance semiconductors in this protector provides superior high frequency response and improved return loss for the four data pairs. The unit has low line to line and line to ground capacitance to minimize distortion of high-speed signals. The design provides protection for both common and differential mode surges. The design utilizes Thyristor diode technology which has superior power handling capability compared to TVS or Zener diode based designs..